diff options
Diffstat (limited to 'drivers/usb/misc/usb3503.c')
| -rw-r--r-- | drivers/usb/misc/usb3503.c | 276 |
1 files changed, 138 insertions, 138 deletions
diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c index 8e7737d7ac0a..322e59381b78 100644 --- a/drivers/usb/misc/usb3503.c +++ b/drivers/usb/misc/usb3503.c @@ -1,30 +1,16 @@ +// SPDX-License-Identifier: GPL-2.0+ /* * Driver for SMSC USB3503 USB 2.0 hub controller driver * * Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com) - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/clk.h> #include <linux/i2c.h> -#include <linux/gpio.h> +#include <linux/gpio/consumer.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/module.h> -#include <linux/of_gpio.h> #include <linux/platform_device.h> #include <linux/platform_data/usb3503.h> #include <linux/regmap.h> @@ -60,34 +46,18 @@ struct usb3503 { struct device *dev; struct clk *clk; u8 port_off_mask; - int gpio_intn; - int gpio_reset; - int gpio_connect; + struct gpio_desc *bypass; + struct gpio_desc *intn; + struct gpio_desc *reset; + struct gpio_desc *connect; bool secondary_ref_clk; }; -static int usb3503_reset(struct usb3503 *hub, int state) -{ - if (!state && gpio_is_valid(hub->gpio_connect)) - gpio_set_value_cansleep(hub->gpio_connect, 0); - - if (gpio_is_valid(hub->gpio_reset)) - gpio_set_value_cansleep(hub->gpio_reset, state); - - /* Wait T_HUBINIT == 4ms for hub logic to stabilize */ - if (state) - usleep_range(4000, 10000); - - return 0; -} - static int usb3503_connect(struct usb3503 *hub) { struct device *dev = hub->dev; int err; - usb3503_reset(hub, 1); - if (hub->regmap) { /* SP_ILOCK: set connect_n, config_n for config */ err = regmap_write(hub->regmap, USB3503_SP_ILOCK, @@ -128,8 +98,8 @@ static int usb3503_connect(struct usb3503 *hub) } } - if (gpio_is_valid(hub->gpio_connect)) - gpio_set_value_cansleep(hub->gpio_connect, 1); + if (hub->connect) + gpiod_set_value_cansleep(hub->connect, 1); hub->mode = USB3503_MODE_HUB; dev_info(dev, "switched to HUB mode\n"); @@ -140,25 +110,46 @@ static int usb3503_connect(struct usb3503 *hub) static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode) { struct device *dev = hub->dev; - int err = 0; + int rst, bypass, conn; switch (mode) { case USB3503_MODE_HUB: - err = usb3503_connect(hub); + conn = 1; + rst = 0; + bypass = 0; break; - case USB3503_MODE_STANDBY: - usb3503_reset(hub, 0); + conn = 0; + rst = 1; + bypass = 1; dev_info(dev, "switched to STANDBY mode\n"); break; - + case USB3503_MODE_BYPASS: + conn = 0; + rst = 0; + bypass = 1; + break; default: dev_err(dev, "unknown mode is requested\n"); - err = -EINVAL; - break; + return -EINVAL; } - return err; + if (!conn && hub->connect) + gpiod_set_value_cansleep(hub->connect, 0); + + if (hub->reset) + gpiod_set_value_cansleep(hub->reset, rst); + + if (hub->bypass) + gpiod_set_value_cansleep(hub->bypass, bypass); + + if (conn) { + /* Wait T_HUBINIT == 4ms for hub logic to stabilize */ + usleep_range(4000, 10000); + return usb3503_connect(hub); + } + + return 0; } static const struct regmap_config usb3503_regmap_config = { @@ -174,18 +165,16 @@ static int usb3503_probe(struct usb3503 *hub) struct usb3503_platform_data *pdata = dev_get_platdata(dev); struct device_node *np = dev->of_node; int err; + bool is_clk_enabled = false; u32 mode = USB3503_MODE_HUB; const u32 *property; + enum gpiod_flags flags; int len; if (pdata) { hub->port_off_mask = pdata->port_off_mask; - hub->gpio_intn = pdata->gpio_intn; - hub->gpio_connect = pdata->gpio_connect; - hub->gpio_reset = pdata->gpio_reset; hub->mode = pdata->initial_mode; } else if (np) { - struct clk *clk; u32 rate = 0; hub->port_off_mask = 0; @@ -211,34 +200,30 @@ static int usb3503_probe(struct usb3503 *hub) } } - clk = devm_clk_get(dev, "refclk"); - if (IS_ERR(clk) && PTR_ERR(clk) != -ENOENT) { + hub->clk = devm_clk_get_optional(dev, "refclk"); + if (IS_ERR(hub->clk)) { dev_err(dev, "unable to request refclk (%ld)\n", - PTR_ERR(clk)); - return PTR_ERR(clk); + PTR_ERR(hub->clk)); + return PTR_ERR(hub->clk); } - if (!IS_ERR(clk)) { - hub->clk = clk; - - if (rate != 0) { - err = clk_set_rate(hub->clk, rate); - if (err) { - dev_err(dev, - "unable to set reference clock rate to %d\n", - (int) rate); - return err; - } - } - - err = clk_prepare_enable(hub->clk); + if (rate != 0) { + err = clk_set_rate(hub->clk, rate); if (err) { dev_err(dev, - "unable to enable reference clock\n"); + "unable to set reference clock rate to %d\n", + (int)rate); return err; } } + err = clk_prepare_enable(hub->clk); + if (err) { + dev_err(dev, "unable to enable reference clock\n"); + return err; + } + + is_clk_enabled = true; property = of_get_property(np, "disabled-ports", &len); if (property && (len / sizeof(u32)) > 0) { int i; @@ -249,56 +234,51 @@ static int usb3503_probe(struct usb3503 *hub) } } - hub->gpio_intn = of_get_named_gpio(np, "intn-gpios", 0); - if (hub->gpio_intn == -EPROBE_DEFER) - return -EPROBE_DEFER; - hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0); - if (hub->gpio_connect == -EPROBE_DEFER) - return -EPROBE_DEFER; - hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0); - if (hub->gpio_reset == -EPROBE_DEFER) - return -EPROBE_DEFER; of_property_read_u32(np, "initial-mode", &mode); hub->mode = mode; } - if (hub->port_off_mask && !hub->regmap) - dev_err(dev, "Ports disabled with no control interface\n"); + if (hub->secondary_ref_clk) + flags = GPIOD_OUT_LOW; + else + flags = GPIOD_OUT_HIGH; + hub->intn = devm_gpiod_get_optional(dev, "intn", flags); + if (IS_ERR(hub->intn)) { + err = PTR_ERR(hub->intn); + goto err_clk; + } + if (hub->intn) + gpiod_set_consumer_name(hub->intn, "usb3503 intn"); - if (gpio_is_valid(hub->gpio_intn)) { - int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW : - GPIOF_OUT_INIT_HIGH; - err = devm_gpio_request_one(dev, hub->gpio_intn, val, - "usb3503 intn"); - if (err) { - dev_err(dev, - "unable to request GPIO %d as interrupt pin (%d)\n", - hub->gpio_intn, err); - return err; - } + hub->connect = devm_gpiod_get_optional(dev, "connect", GPIOD_OUT_LOW); + if (IS_ERR(hub->connect)) { + err = PTR_ERR(hub->connect); + goto err_clk; } + if (hub->connect) + gpiod_set_consumer_name(hub->connect, "usb3503 connect"); - if (gpio_is_valid(hub->gpio_connect)) { - err = devm_gpio_request_one(dev, hub->gpio_connect, - GPIOF_OUT_INIT_LOW, "usb3503 connect"); - if (err) { - dev_err(dev, - "unable to request GPIO %d as connect pin (%d)\n", - hub->gpio_connect, err); - return err; - } + hub->bypass = devm_gpiod_get_optional(dev, "bypass", GPIOD_OUT_HIGH); + if (IS_ERR(hub->bypass)) { + err = PTR_ERR(hub->bypass); + goto err_clk; } + if (hub->bypass) + gpiod_set_consumer_name(hub->bypass, "usb3503 bypass"); - if (gpio_is_valid(hub->gpio_reset)) { - err = devm_gpio_request_one(dev, hub->gpio_reset, - GPIOF_OUT_INIT_LOW, "usb3503 reset"); - if (err) { - dev_err(dev, - "unable to request GPIO %d as reset pin (%d)\n", - hub->gpio_reset, err); - return err; - } + hub->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(hub->reset)) { + err = PTR_ERR(hub->reset); + goto err_clk; } + if (hub->reset) { + /* Datasheet defines a hardware reset to be at least 100us */ + usleep_range(100, 10000); + gpiod_set_consumer_name(hub->reset, "usb3503 reset"); + } + + if (hub->port_off_mask && !hub->regmap) + dev_err(dev, "Ports disabled with no control interface\n"); usb3503_switch_mode(hub, hub->mode); @@ -306,10 +286,14 @@ static int usb3503_probe(struct usb3503 *hub) (hub->mode == USB3503_MODE_HUB) ? "hub" : "standby"); return 0; + +err_clk: + if (is_clk_enabled) + clk_disable_unprepare(hub->clk); + return err; } -static int usb3503_i2c_probe(struct i2c_client *i2c, - const struct i2c_device_id *id) +static int usb3503_i2c_probe(struct i2c_client *i2c) { struct usb3503 *hub; int err; @@ -330,15 +314,12 @@ static int usb3503_i2c_probe(struct i2c_client *i2c, return usb3503_probe(hub); } -static int usb3503_i2c_remove(struct i2c_client *i2c) +static void usb3503_i2c_remove(struct i2c_client *i2c) { struct usb3503 *hub; hub = i2c_get_clientdata(i2c); - if (hub->clk) - clk_disable_unprepare(hub->clk); - - return 0; + clk_disable_unprepare(hub->clk); } static int usb3503_platform_probe(struct platform_device *pdev) @@ -354,50 +335,62 @@ static int usb3503_platform_probe(struct platform_device *pdev) return usb3503_probe(hub); } -static int usb3503_platform_remove(struct platform_device *pdev) +static void usb3503_platform_remove(struct platform_device *pdev) { struct usb3503 *hub; hub = platform_get_drvdata(pdev); - if (hub->clk) - clk_disable_unprepare(hub->clk); + clk_disable_unprepare(hub->clk); +} + +static int __maybe_unused usb3503_suspend(struct usb3503 *hub) +{ + usb3503_switch_mode(hub, USB3503_MODE_STANDBY); + clk_disable_unprepare(hub->clk); return 0; } -#ifdef CONFIG_PM_SLEEP -static int usb3503_i2c_suspend(struct device *dev) +static int __maybe_unused usb3503_resume(struct usb3503 *hub) { - struct i2c_client *client = to_i2c_client(dev); - struct usb3503 *hub = i2c_get_clientdata(client); + clk_prepare_enable(hub->clk); + usb3503_switch_mode(hub, hub->mode); - usb3503_switch_mode(hub, USB3503_MODE_STANDBY); + return 0; +} - if (hub->clk) - clk_disable_unprepare(hub->clk); +static int __maybe_unused usb3503_i2c_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); - return 0; + return usb3503_suspend(i2c_get_clientdata(client)); } -static int usb3503_i2c_resume(struct device *dev) +static int __maybe_unused usb3503_i2c_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); - struct usb3503 *hub = i2c_get_clientdata(client); - if (hub->clk) - clk_prepare_enable(hub->clk); + return usb3503_resume(i2c_get_clientdata(client)); +} - usb3503_switch_mode(hub, hub->mode); +static int __maybe_unused usb3503_platform_suspend(struct device *dev) +{ + return usb3503_suspend(dev_get_drvdata(dev)); +} - return 0; +static int __maybe_unused usb3503_platform_resume(struct device *dev) +{ + return usb3503_resume(dev_get_drvdata(dev)); } -#endif static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend, usb3503_i2c_resume); +static SIMPLE_DEV_PM_OPS(usb3503_platform_pm_ops, usb3503_platform_suspend, + usb3503_platform_resume); + static const struct i2c_device_id usb3503_id[] = { - { USB3503_I2C_NAME, 0 }, + { USB3503_I2C_NAME }, { } }; MODULE_DEVICE_TABLE(i2c, usb3503_id); @@ -406,6 +399,7 @@ MODULE_DEVICE_TABLE(i2c, usb3503_id); static const struct of_device_id usb3503_of_match[] = { { .compatible = "smsc,usb3503", }, { .compatible = "smsc,usb3503a", }, + { .compatible = "smsc,usb3803", }, {}, }; MODULE_DEVICE_TABLE(of, usb3503_of_match); @@ -414,7 +408,7 @@ MODULE_DEVICE_TABLE(of, usb3503_of_match); static struct i2c_driver usb3503_i2c_driver = { .driver = { .name = USB3503_I2C_NAME, - .pm = &usb3503_i2c_pm_ops, + .pm = pm_ptr(&usb3503_i2c_pm_ops), .of_match_table = of_match_ptr(usb3503_of_match), }, .probe = usb3503_i2c_probe, @@ -426,6 +420,7 @@ static struct platform_driver usb3503_platform_driver = { .driver = { .name = USB3503_I2C_NAME, .of_match_table = of_match_ptr(usb3503_of_match), + .pm = pm_ptr(&usb3503_platform_pm_ops), }, .probe = usb3503_platform_probe, .remove = usb3503_platform_remove, @@ -436,13 +431,18 @@ static int __init usb3503_init(void) int err; err = i2c_add_driver(&usb3503_i2c_driver); - if (err != 0) + if (err) { pr_err("usb3503: Failed to register I2C driver: %d\n", err); + return err; + } err = platform_driver_register(&usb3503_platform_driver); - if (err != 0) + if (err) { pr_err("usb3503: Failed to register platform driver: %d\n", err); + i2c_del_driver(&usb3503_i2c_driver); + return err; + } return 0; } |